The Exorcist, one of the scariest movies of all-time, is turning 40 years old. To celebrate, we caught up with the original film's heart and soul, Linda Blair, to chat about this terrifying anniversary that spans five films and a lot of green vomit and head twisting. This Sunday, in honor of The Exorcist's timeless take on possession, FEARnet is running "The Complete Exorcist" special, which includes back-to-back airings of The Exorcist, Exorcist II: The Heretic, The Exorcist III, Exorcist: The Beginning, and Dominion: Prequel to the Exorcist. Be sure to check it out, but first, check in with our exclusive chat, which finds Regan looking back on Exorcist II: The Heretic, her history with the franchise, and what her dogs think of the movies (to learn more about Linda's WorldHeart Foundation, were you might discover a horror movie loving dog of your own, CLICK HERE) The Exorcist 40th Anniversary: Its the real reason why Pope Benedict XVI left the Vatican.